Linux总线设备驱动

最新推荐文章于 2025-06-07 17:14:56 发布

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最新推荐文章于 2025-06-07 17:14:56 发布 · 846 阅读

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CC 4.0 BY-SA版权

本文详细解析了Linux系统中平台设备驱动的注册和匹配过程，从`platform_device_register`到`device_add`，再到`driver_register`和`driver_probe_device`，最终都调用了`drv->probe(dev)`进行设备探测。文章通过代码分析，阐述了设备驱动如何与总线类型`platform_bus_type`结合，并使用`match()`函数进行匹配。

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static const struct sysfs_ops dev_sysfs_ops = {
    .show    = dev_attr_show,
    .store    = dev_attr_store,
};
static struct kobj_type device_ktype = {
    .release    = device_release,
    .sysfs_ops    = &dev_sysfs_ops,
    .namespace    = device_namespace,
};
struct bus_type platform_bus_type = {
    .name       = "platform",
    .dev_attrs   = platform_dev_attrs,
    .match       = platform_match,
    .uevent       = platform_uevent,
    .pm       = &platform_dev_pm_ops,
};
struct device_attribute {
    struct attribute attr;
    ssize_t (*show)(structdevice* dev, struct device_attribute* attr,char* buf);
    ssize_t (*store)(structdevice* dev, struct device_attribute* attr, const char* buf, size_t count);
};
static struct device_attribute platform_dev_attrs[] = {
    __ATTR_RO(modalias),
    __ATTR_NULL,
};

platform_device_register
    -->device_initialize(&pdev->dev);
            -->...
            -->dev->kobj.kset = devices_kset;
            -->kobject_init(&dev->kobj, &device_ktype);
            -->...
    -->return platform_device_add(pdev);
            -->...
            -->pdev->dev.bus = &platform_bus_type; //match()被注册
            --> ret = device_add(&pdev->dev);